Puck spring for a sample tube holder



FIG. 1 is a top perspective view of a puck spring for a sample tube holder, showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is another side elevational view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a puck spring for a sample tube holder, as shown and described. 